问题补充:
It was he took off his dark glasses I realized he was a famous singer.
A. until,that
B. not until,that
C. not until,when
D. when,then
答案:
A. until,that
(答案→)B. not until,that
C. not until,when
D. when,then
解析::考查强调句型。强调句型:it is/was本强调成分that/who其它成分;本题强调时间状语not until he took off his dark glasses;句意:直到他摘掉眼镜,我才意识到他是一个著名的歌手。故B正确。